Question

add commas, semicolons, or colons if needed. otherwise, submit the text without any additional punctuation. zinc is a trace element found in the pancreas, where it may help store insulin in the gastrointestinal tract, where its a part of enzymes that digest protein and in red blood cells.

Explanation:

The sentence lists three places where zinc is found. A semicolon is used to separate the first two independent clauses (about the pancreas and the gastrointestinal tract) as they are more complex and a comma would cause confusion. A comma is used before "and" for the last item in the list (red blood cells) as per standard list punctuation rules.

Answer:

Zinc is a trace element found in the pancreas, where it may help store insulin; in the gastrointestinal tract, where it's a part of enzymes that digest protein, and in red blood cells.